Shuttle for sewing-machines



(No Model.)

J. BOLTON.

SHUTTLE FOR SEWING MACHINES.

.No. 484,395. PatentedOot. 18, 1892.

7/119??? e s s a s; Dyan/i07 UNITED STATES PATENT OFFICE.

JAMES BOLTON, OF CHICAGO, ILLINOIS.

SHUTTLE FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 484,395, dated October 18, 1892.

Application filed February 2, 1892.

To all whom it may concern:

Be it known that 1, JAMES BOLTON, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Sewing-Machine Shuttles, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention has for its object to provide an evenly-balanced sewing-machine shuttle of the class generally known as cylindrical shuttles, or shuttles in which the main por tion thereof is in the form of a hollow cylinder adapted to contain a long bobbin.

The special object of my invention is to provide a shuttle of the class referred to which will be evenly balanced, which will lie steadily in the carrier, and which is of such construction as best to resist the wear against the shuttle-race to which it is necessarily subjected.

To this end my improved shuttle consists of a body of general cylindrical form, but having a straight lower face, which is formed fiat, so that it may rest steadily on the carrier to prevent the tendency of the shuttle to rock. The body of said shuttle has at its upper side a heavy centrally-located longitudinal rib, the outer face of which is curved in the true are of a circle in which the shuttle is to vibrate, and which meets and intersects the lower face at the point of the shuttle.

In the drawings, Figure 1 is a side view of my improved shuttle. Figs. 2 and 3 are top and bottom views, respectively, thereof. Fig. 4 is a rear end View; and Fig. 5, a cross-section on line 5 5, Fig. 1.

A denotes the body of the shuttle, provided at its upper side with a centrally-arranged heavy longitudinal rib b, curved in the true are of a circle in which the shuttle is to vibrate, said rib projecting above the cylindrical body of the shuttle. The lower face 0 of Serial No. 420,036- (No model.)

the shuttle is formed flat and is straight, so

that it intersects the curved upper face of the shuttle at the point of the latter. This flat lower face adapts the shuttle to rest steadily on a vertically-arranged carrier and prevents the tendency of the shuttle to rock in the carrier as it is vibrated back and forth. The heavy rib b, which is located as nearly as possible midway of the body of the shuttle, has a tendency to balance the latter, so as to hold it steadily in the carrier, and it also aifords a wide bearing-surface for the shuttle against the face of the shuttle-race, so that the wear of the shuttle against the said race caused by centrifugal force will be reduced to a minimum. In other words, the heavy rib 1) offers such an extended wearing-surface that the shuttle will wear away much less rapidly than would be the case if the wearing-surface were of lesser extent.

Having thus described my invention, I claim and desire to secure by Letters Patent- 1. A cylindrical sewingmachine shuttle having a straight lower face and provided at its upper side with a heavy longitudinal upwardly-projecting rib, which is centrally-arranged laterally relative to the body of the shuttle and which is curved in the true arc of a circle, so as to intersect the said straight lower face at the point of the shuttle. 4

2. A cylindrical sewing machine shuttle having a straight and flattened lower face and provided at its upper side or face with a centrally-arranged heavy longitudinal rib, the outer face of which is curved in the true are of a circle and which intersects the said lower face at the point of the shuttle.

In testimony whereof I affix my signature in presence of two witnesses.

JAMES BOLTON.

WVitn esses: HENRY OALvER, HELON V. CusHMAN. 

